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Math · Statistics And Probability
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Independent Samples t Test in SPSS

  • Criterion: Calculate an independent samples t test in SPSS.
  • Data: Ms Z has two groups of band students. She asks Group 1 to use her new embouchure strengthening cream before practice and has Group 2 practice as usual. The groups scored as following:
    • Minutes of practice:
      • Group 1: 55, 44, 62, 30, 78, 50, 52.
      • Group 2: 31, 40, 53, 22, 41, 16, 33.

Group Statistics

Groups

N

Mean

Std. Deviation

Std. Error Mean

Minutes

Embouchure Cream

1

55.0000

.

.

No Cream

1

31.0000

.

.

Levene's Test for Equality of Variances

t-test for Equality of Means

F

Sig.

t

df

Sig. (2-tailed)

Mean Difference

Std. Error Difference

95% Confidence Interval of the Difference

Lower

Upper

Minutes

Equal variances assumed

.

.

.

0

.

24.00000

.

.

.

Equal variances not assumed

.

.

.

24.00000

.

.

.

Problem Set 3.14: Independent Samples t Test

Criterion: Identify IV, DV, and hypotheses, and evaluate the null hypothesis for an independent samples t test.

Data: Use the information from Problem Set 3.13.

Instruction: Complete the following:

a.   Identify the IV and DV in this study.

b.   State the null hypothesis and the directional (one-tailed) alternative hypothesis.

c.   Can you reject the null hypothesis at α = .05? Explain why or why not.

Answer
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